US20190094559A1 - Process for producing, by etching through a lenticular grating, images that may be selectively viewed by varying angle of observation - Google Patents
Process for producing, by etching through a lenticular grating, images that may be selectively viewed by varying angle of observation Download PDFInfo
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- US20190094559A1 US20190094559A1 US16/065,999 US201616065999A US2019094559A1 US 20190094559 A1 US20190094559 A1 US 20190094559A1 US 201616065999 A US201616065999 A US 201616065999A US 2019094559 A1 US2019094559 A1 US 2019094559A1
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- G02B27/2214—
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
- B41M3/148—Transitory images, i.e. images only visible from certain viewing angles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/324—Reliefs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/41—Marking using electromagnetic radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/22—Removing surface-material, e.g. by engraving, by etching
- B44C1/228—Removing surface-material, e.g. by engraving, by etching by laser radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44F—SPECIAL DESIGNS OR PICTURES
- B44F1/00—Designs or pictures characterised by special or unusual light effects
- B44F1/08—Designs or pictures characterised by special or unusual light effects characterised by colour effects
- B44F1/10—Changing, amusing, or secret pictures
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/10—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images using integral imaging methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
Definitions
- the present invention relates to a method for producing at least two images that can be selectively viewed by varying the angle of observation.
- the interleaving is performed first, typically by printing, to be then placed under the lenticular grating.
- a laser-sensitive layer is arranged under the lenticular grating and the images are produced by laser etching through the lenticular grating.
- Customization is understood to mean an individualization of the device, in which an image depends on individual data, for example linked to the bearer of the device. This is so, for example, when an image reproduces an identity photo of the bearer. This is made possible by the laser etching operation which allows for production to be delayed in the fabrication method, when the data are available, and adapted to a single device.
- a laser etching is conventionally performed by means of a setup 1 comprising a laser 2 , capable of emitting a laser beam 12 , a galvanometric head 3 comprising two mirrors that are mobile in order to be able to deflect the laser beam 12 in space in order to scan the surface of the etching zone 6 containing the image to be etched, and a lens 4 cable of focusing the laser beam 12 .
- a setup 1 particularly its lens 4 , defines an optical axis Z and a working zone 5 .
- the optical axis Z is the central laser firing axis.
- the working zone 5 is a zone, centered about the optical axis Z, where an etching is possible. Beyond the working zone 5 , the optical deformations are too great.
- a device 11 that is to be etched in an etching zone 6 is centered on the optical axis Z.
- the etching zone 6 is covered by a lenticular grating 9 , through which the laser beam 12 passes.
- the prior art proposes at least two approaches to address this need.
- the orientation of the device relative to the laser etching setup is modified. This is done by placing the device on a plate that can be tilted about an axis at right angles to the optical axis.
- One drawback with such an approach is the mechanical complexity of such a tiltable plate.
- such a plate has to be also translationally mobile along the optical axis in order to correct a defocusing produced by the tilting.
- an image deflection mirror is used to deflect the laser beam and thus obtain different mean etching angles.
- One significant drawback is that the adjustment of a deflection mirror depends on the position of the etching zone relative to the device, and thus makes it difficult to change this position.
- Another drawback is that the distance traveled by the laser beam can be different depending on the location of the image and can lead to variations of the laser density.
- such an approach does not make it possible to produce a registration through the galvanometric head, which is mandatory in particular when producing a color image.
- the present invention remedies these various drawbacks.
- the subject of the invention is a method for producing a first image and at least one second image, that can be selectively viewed by varying the angle of observation, under a lenticular grating, in an etching zone, by laser etching, by means of a setup comprising: a laser capable of emitting a laser beam, a galvanometric head capable of deflecting the laser beam and a lens capable of focusing the laser beam, and defining an optical axis and a working zone, comprising the following steps: placing of the etching zone at a first location, included in the working zone, at the periphery of the working zone, and at right angles to the optical axis, etching of the first image, placing of the etching zone at a second location different from the first location, included in the working zone, at the periphery of the working zone, and at right angles to the optical axis, etching of the second image.
- the etching of an image is produced by means of the laser beam deflected by the galvanometric head so as to scan the etching zone.
- the lens is a scanning lens.
- the second location is symmetrical to the first location, relative to the optical axis.
- the lenticular grating is cylindrical and the second location is symmetrical to the first location, relative to an axis parallel to the axis of the lenticular grating, intersecting the optical axis, and situated in the plane of the lenticular grating.
- the first location and the second location are situated in one and the same plane relative to the optical axis.
- a location is at a distance from the optical axis so that the mean angle of the laser beam relative to the optical axis is greater than or equal to 15°.
- the size of the etching zone is small compared to the size of the working zone, preferentially less than 15% of the size of the working zone.
- the etching of a large image is produced by subdividing the image into contiguous parts, each part being assigned to a contiguous etching zone, and by performing, for each part: placing of the etching zone corresponding to said part at the periphery of the working zone and at right angles to the optical axis, etching of said part of the image.
- the method is applied to the customization of an identity document.
- the invention relates also to a device obtained by such a method.
- the lenticular grating or at least one of the etched images occupies a surface greater than 1 cm 2 , preferentially greater than 3.5 ⁇ 4.5 cm.
- a color matrix is arranged under the lenticular grating in order to be able to etch at least one color image.
- the first image and said at least one second image are paired so as to produce a 3D effect.
- FIG. 1 already described, presents, in a side view, the device during etching
- FIG. 2 already described, presents, in a plan view, the device of FIG. 1 ,
- FIG. 3 presents, in a side view, a device during etching to produce a first image
- FIG. 4 presents a plan view corresponding to FIG. 3 .
- FIG. 5 presents, in a side view, the device of FIGS. 3 and 4 , during etching to produce a second image
- FIG. 6 presents a plan view corresponding to FIG. 5 .
- the production of an image according to the invention is obtained by laser etching, as previously described with reference to FIGS. 1 and 2 .
- a laser beam 12 fired by a laser 2 is deflected by a galvanometric head 3 in order to scan the surface of an etching zone 6 covering at least all the surface of the image.
- the deflected laser beam 12 is corrected by passing through a lens 4 .
- the etching zone 6 is covered by a lenticular grating 9 .
- the laser beam 12 passes through the lenticular grating 9 to reach a sensitive layer, present in the etching zone 6 , and which darkens in proportion to the received laser power.
- This selective carbonization makes it possible to create a gray level monochrome image directly or a color image as described in FR 11714352 or FR 1103919 indirectly by selective masking of a color matrix.
- the basic idea of the invention is to exploit the high angles of incidence resulting from an arrangement of the etching zone 6 at the periphery of the working zone 5 .
- the etching zone 6 is placed at a first location 7 .
- This location 7 is necessarily included in the working zone 5 , for it to be possible to produce an etching of good quality. It is also arranged substantially at the periphery of the working zone 5 , which advantageously makes it possible to obtain an angle of incidence, the angle between the laser beam 12 and the optical axis Z, of the highest order.
- the device 11 and the etching zone 6 remain at right angles to the optical axis Z, in order to remain within the nominal conditions, of focal length in particular, of use of the setup 1 .
- the first image can be etched, in a conventional way, during a second step.
- the etching zone 6 is displaced to be placed at a second location 8 .
- This second location 8 is necessarily included in the working zone 5 , for it to be possible to perform an etching of good quality. It is also arranged substantially at the periphery of the working zone 5 , which advantageously makes it possible to obtain an angle of incidence, of the highest order.
- the second location 8 is chosen in order for this angle to be remote from the angle of incidence obtained for the first location 7 .
- the device 11 and the etching zone 6 remain at right angles to the optical axis Z, in order to remain within the nominal conditions of use of the setup 1 .
- the second image can be etched, in a conventional manner, during a fourth step.
- the function of the lens 4 that is employed is to straighten the distortions caused by the spherical scanning of the galvanometric head 3 followed by a projection onto the plane of the device 11 , merged with the plane of the etching zone 6 .
- a lens 4 that is conventionally employed for that is a scanning lens, also called F-theta lens.
- Such a scanning lens has the property of providing a deflection (in the image plane) proportional to the deflection angle (angle of the beam 12 on entering the lens. This makes it possible to retain a constant point size despite a variation of the deflection angle of the beam 12 .
- the second location 8 is symmetrical to the first location 7 , relative to the optical axis Z.
- the first location 7 allows a mean angle of incidence X°
- the second location 8 allows an opposite angle ⁇ X°.
- the lenticular grating 9 can be of any type. Based on the type, the person skilled in the art will adapt the teachings contained herein to the particular type of lenticular grating 9 .
- the mean laser firing angle of incidence changes by rotating about the axis 10 of the lenticular grating 9 .
- the second location 8 is advantageously chosen to be symmetrical to the first location 7 , relative to a parallel to the axis 10 of the lenticular grating 9 , having an intersection with the optical axis Z, and situated in the working plane or plane of the lenticular grating 9 .
- the first location 7 and the second location 8 are situated in one and the same plane relative to the optical axis Z. This corresponds to one and the same working plane for which the setup 1 is optimized.
- the device 11 and the etching zone 6 are in the depth of field of the setup 1 .
- this feature is advantageous in that it makes it possible to produce a displacement of the device 11 from the first location 7 to the second location 8 by a simple translational movement in its plane. Such a movement can easily be produced by translation of a plate bearing the device 11 or by translation of the device 11 on said plate.
- the locations 7 , 8 must be at the periphery of the working zone 5 , i.e. such that the edge of the etching zone 6 is substantially tangential to the edge of the working zone 5 .
- the locations 7 , 8 are at a distance from one another and/or from the optical axis Z, such that the mean angle of the laser beam 12 , relative to the optical axis Z, is greater than or equal to 15°.
- Each lens 4 conventionally used determines an aperture angle.
- a length of 100 mm diameter allows a working zone of 35 mm size/radius and must be used at a lens/device distance of 120 mm.
- a lens of 163 mm diameter allows a working zone of 60 mm size/radius and must be used at a lens/device distance of 200 mm.
- the half-aperture angle is thus substantially the same, slightly less than 17°.
- a mean angle of incidence of 15° is therefore feasible at the periphery of the working zone 5 .
- a viewing system can advantageously see through the assembly of galvanometric head 3 and lens 4 , and be used to produce a registration. This is made possible by the fact that registration marks, present on the device 11 , are visible, the device 11 being visible in its entirety, and identically in itself from one location 7 , 8 to the other, through the galvanometric head 3 and the lens 4 .
- the constraint described previously of limiting of the maximum size of the etching zone 6 does not however limit the size of an etched image.
- a large image i.e. an image larger than the maximum size for an etching zone 6
- Each part is assigned to a corresponding etching zone 6 .
- the etching zones 6 are therefore contiguous in the same way that the parts are contiguous.
- the following is then performed for each part: placing of the etching zone 6 corresponding to said part at the periphery of the working zone 5 and at right angles to the optical axis Z and etching of said part of the image.
- etching zone 6 is arranged at the periphery of the working zone 5 guarantees that the mean angle of incidence of the laser beam 12 is high. A large image can thus be etched, part by part, by repositioning the support and each etching zone between two parts, so as to always retain a high mean angle of incidence of the laser beam 12 .
- the constraint of size of the etching zone 6 that can be etched in a single operation, without displacement of the support, does not lead to any limitation of the size of an image.
- the size of at least one image, if necessary covered by the lenticular grating 9 is not limited and can occupy a surface greater than 1 cm 2 . It is thus possible to produce, for example, an image of a size greater than 3.5 ⁇ 4.5 cm, thus making it possible to produce an identity photo.
- the plurality of etched images comprising the first image and said at least one second image are chosen paired so as to produce a 3D effect. Paired is understood here to mean images of one and the same subject/object seen from different angles, so as to reproduce a relief effect when the images are seen in sequence.
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Abstract
Description
- The present invention relates to a method for producing at least two images that can be selectively viewed by varying the angle of observation.
- It is known practice to produce such images by interleaving said images and by arranging the resulting interleaving under a lenticular grating. This combination of an interleaving and of a suitable lenticular grating makes it possible to obtain a device in which a first image can be viewed when the device is observed according to a first angle of observation and at least one second image can be viewed when the device is observed according to a second angle of observation, different from the first angle of observation.
- According to one family of methods, the interleaving is performed first, typically by printing, to be then placed under the lenticular grating.
- According to another family of methods, more particularly suited to customization, a laser-sensitive layer is arranged under the lenticular grating and the images are produced by laser etching through the lenticular grating.
- Customization is understood to mean an individualization of the device, in which an image depends on individual data, for example linked to the bearer of the device. This is so, for example, when an image reproduces an identity photo of the bearer. This is made possible by the laser etching operation which allows for production to be delayed in the fabrication method, when the data are available, and adapted to a single device.
- As illustrated in
FIGS. 1 and 2 , a laser etching is conventionally performed by means of asetup 1 comprising a laser 2, capable of emitting alaser beam 12, a galvanometric head 3 comprising two mirrors that are mobile in order to be able to deflect thelaser beam 12 in space in order to scan the surface of theetching zone 6 containing the image to be etched, and alens 4 cable of focusing thelaser beam 12. Such asetup 1, particularly itslens 4, defines an optical axis Z and aworking zone 5. The optical axis Z is the central laser firing axis. Theworking zone 5 is a zone, centered about the optical axis Z, where an etching is possible. Beyond theworking zone 5, the optical deformations are too great. - According to the prior art, a
device 11 that is to be etched in anetching zone 6, is centered on the optical axis Z. - The
etching zone 6 is covered by alenticular grating 9, through which thelaser beam 12 passes. - Through the very principle of lenticular gratings, it is necessary, in order to separate two images to avoid any visual interference, to etch each image according to a mean angle at a distance from the mean angle of another image.
- The prior art proposes at least two approaches to address this need.
- According to a first approach, for example illustrated by WO 2011074956, the orientation of the device relative to the laser etching setup is modified. This is done by placing the device on a plate that can be tilted about an axis at right angles to the optical axis. One drawback with such an approach is the mechanical complexity of such a tiltable plate.
- Furthermore, such a plate has to be also translationally mobile along the optical axis in order to correct a defocusing produced by the tilting.
- According to another approach, typically illustrated by EP 2050574, an image deflection mirror, adjustable in orientation but fixed during an etching, is used to deflect the laser beam and thus obtain different mean etching angles. One significant drawback is that the adjustment of a deflection mirror depends on the position of the etching zone relative to the device, and thus makes it difficult to change this position. Another drawback is that the distance traveled by the laser beam can be different depending on the location of the image and can lead to variations of the laser density. Furthermore, such an approach does not make it possible to produce a registration through the galvanometric head, which is mandatory in particular when producing a color image.
- The present invention remedies these various drawbacks.
- The subject of the invention is a method for producing a first image and at least one second image, that can be selectively viewed by varying the angle of observation, under a lenticular grating, in an etching zone, by laser etching, by means of a setup comprising: a laser capable of emitting a laser beam, a galvanometric head capable of deflecting the laser beam and a lens capable of focusing the laser beam, and defining an optical axis and a working zone, comprising the following steps: placing of the etching zone at a first location, included in the working zone, at the periphery of the working zone, and at right angles to the optical axis, etching of the first image, placing of the etching zone at a second location different from the first location, included in the working zone, at the periphery of the working zone, and at right angles to the optical axis, etching of the second image.
- According to another feature, the etching of an image is produced by means of the laser beam deflected by the galvanometric head so as to scan the etching zone.
- According to another feature, the lens is a scanning lens.
- According to another feature, the second location is symmetrical to the first location, relative to the optical axis.
- According to another feature, the lenticular grating is cylindrical and the second location is symmetrical to the first location, relative to an axis parallel to the axis of the lenticular grating, intersecting the optical axis, and situated in the plane of the lenticular grating.
- According to another feature, the first location and the second location are situated in one and the same plane relative to the optical axis.
- According to another feature, a location is at a distance from the optical axis so that the mean angle of the laser beam relative to the optical axis is greater than or equal to 15°.
- According to another feature, the size of the etching zone is small compared to the size of the working zone, preferentially less than 15% of the size of the working zone.
- According to another feature, the etching of a large image is produced by subdividing the image into contiguous parts, each part being assigned to a contiguous etching zone, and by performing, for each part: placing of the etching zone corresponding to said part at the periphery of the working zone and at right angles to the optical axis, etching of said part of the image.
- According to another feature, the method is applied to the customization of an identity document.
- The invention relates also to a device obtained by such a method.
- According to another feature, the lenticular grating or at least one of the etched images occupies a surface greater than 1 cm2, preferentially greater than 3.5×4.5 cm.
- According to another feature, a color matrix is arranged under the lenticular grating in order to be able to etch at least one color image.
- According to another feature, the first image and said at least one second image are paired so as to produce a 3D effect.
- Other features, details and advantages of the invention will become more clearly apparent from the detailed description given hereinbelow by way of indication in relation to the drawings in which:
-
FIG. 1 , already described, presents, in a side view, the device during etching, -
FIG. 2 , already described, presents, in a plan view, the device ofFIG. 1 , -
FIG. 3 presents, in a side view, a device during etching to produce a first image, -
FIG. 4 presents a plan view corresponding toFIG. 3 , -
FIG. 5 presents, in a side view, the device ofFIGS. 3 and 4 , during etching to produce a second image, -
FIG. 6 presents a plan view corresponding toFIG. 5 . - The production of an image according to the invention is obtained by laser etching, as previously described with reference to
FIGS. 1 and 2 . Alaser beam 12 fired by a laser 2 is deflected by a galvanometric head 3 in order to scan the surface of anetching zone 6 covering at least all the surface of the image. The deflectedlaser beam 12 is corrected by passing through alens 4. Theetching zone 6 is covered by alenticular grating 9. Thelaser beam 12 passes through thelenticular grating 9 to reach a sensitive layer, present in theetching zone 6, and which darkens in proportion to the received laser power. This selective carbonization makes it possible to create a gray level monochrome image directly or a color image as described in FR 11714352 or FR 1103919 indirectly by selective masking of a color matrix. - In the case of multiple images that can be selectively viewed by varying the angle of observation, such etching through the
lenticular grating 9 requires very distinct angles from one image to the other. - For that, the basic idea of the invention is to exploit the high angles of incidence resulting from an arrangement of the
etching zone 6 at the periphery of theworking zone 5. - The method then comprises the following steps. During a first step, more particularly illustrated in
FIGS. 3 and 4 , theetching zone 6 is placed at afirst location 7. Thislocation 7 is necessarily included in theworking zone 5, for it to be possible to produce an etching of good quality. It is also arranged substantially at the periphery of theworking zone 5, which advantageously makes it possible to obtain an angle of incidence, the angle between thelaser beam 12 and the optical axis Z, of the highest order. Thedevice 11 and theetching zone 6 remain at right angles to the optical axis Z, in order to remain within the nominal conditions, of focal length in particular, of use of thesetup 1. - After this placing, the first image can be etched, in a conventional way, during a second step.
- During a third step, more particularly illustrated in
FIGS. 5 and 6 , theetching zone 6 is displaced to be placed at a second location 8. This second location 8 is necessarily included in theworking zone 5, for it to be possible to perform an etching of good quality. It is also arranged substantially at the periphery of theworking zone 5, which advantageously makes it possible to obtain an angle of incidence, of the highest order. The second location 8 is chosen in order for this angle to be remote from the angle of incidence obtained for thefirst location 7. Thedevice 11 and theetching zone 6 remain at right angles to the optical axis Z, in order to remain within the nominal conditions of use of thesetup 1. - After this placing, the second image can be etched, in a conventional manner, during a fourth step.
- The function of the
lens 4 that is employed is to straighten the distortions caused by the spherical scanning of the galvanometric head 3 followed by a projection onto the plane of thedevice 11, merged with the plane of theetching zone 6. Alens 4 that is conventionally employed for that is a scanning lens, also called F-theta lens. Such a scanning lens has the property of providing a deflection (in the image plane) proportional to the deflection angle (angle of thebeam 12 on entering the lens. This makes it possible to retain a constant point size despite a variation of the deflection angle of thebeam 12. - According to one embodiment, the second location 8 is symmetrical to the
first location 7, relative to the optical axis Z. Thus, if thefirst location 7 allows a mean angle of incidence X° , the second location 8 allows an opposite angle −X°. - The
lenticular grating 9 can be of any type. Based on the type, the person skilled in the art will adapt the teachings contained herein to the particular type oflenticular grating 9. - In the particular case, corresponding to the great majority of cases of use, in which the
lenticular grating 9 is cylindrical, the mean laser firing angle of incidence changes by rotating about theaxis 10 of thelenticular grating 9. Also, as illustrated inFIGS. 3-6 , the second location 8 is advantageously chosen to be symmetrical to thefirst location 7, relative to a parallel to theaxis 10 of thelenticular grating 9, having an intersection with the optical axis Z, and situated in the working plane or plane of thelenticular grating 9. - According to another feature, the
first location 7 and the second location 8 are situated in one and the same plane relative to the optical axis Z. This corresponds to one and the same working plane for which thesetup 1 is optimized. Thedevice 11 and theetching zone 6 are in the depth of field of thesetup 1. In addition, this feature is advantageous in that it makes it possible to produce a displacement of thedevice 11 from thefirst location 7 to the second location 8 by a simple translational movement in its plane. Such a movement can easily be produced by translation of a plate bearing thedevice 11 or by translation of thedevice 11 on said plate. - In all cases, and for all the types of
lenticular grating 9, thelocations 7, 8 must be at the periphery of the workingzone 5, i.e. such that the edge of theetching zone 6 is substantially tangential to the edge of the workingzone 5. In order to clearly separate the etched images, thelocations 7, 8 are at a distance from one another and/or from the optical axis Z, such that the mean angle of thelaser beam 12, relative to the optical axis Z, is greater than or equal to 15°. - Each
lens 4 conventionally used determines an aperture angle. Thus, a length of 100 mm diameter allows a working zone of 35 mm size/radius and must be used at a lens/device distance of 120 mm. A lens of 163 mm diameter allows a working zone of 60 mm size/radius and must be used at a lens/device distance of 200 mm. The half-aperture angle is thus substantially the same, slightly less than 17°. A mean angle of incidence of 15° is therefore feasible at the periphery of the workingzone 5. - Still, in order to separate the images, it is best to keep a central angle in proximity to the optical axis Z unused for the etching of the images. This amounts to not using the central zone of the working
zone 5. By avoiding a central cone of 10° half-angle, this amounts to not using a central zone of 30% of the size/diameter of the workingzone 5 or of 15% of the half-size/radius. - This later constraint limits the maximum size of the
etching zone 6 but makes it possible to benefit from the advantages of the invention: the displacement of thedevice 11 between thedifferent locations 7, 8 is simple and repeatable. - Furthermore, a viewing system can advantageously see through the assembly of galvanometric head 3 and
lens 4, and be used to produce a registration. This is made possible by the fact that registration marks, present on thedevice 11, are visible, thedevice 11 being visible in its entirety, and identically in itself from onelocation 7, 8 to the other, through the galvanometric head 3 and thelens 4. - The constraint described previously of limiting of the maximum size of the
etching zone 6 does not however limit the size of an etched image. For a large image, i.e. an image larger than the maximum size for anetching zone 6, it is possible to subdivide the image into contiguous parts, each of a size smaller than the maximum size of anetching zone 6. Each part is assigned to a correspondingetching zone 6. Theetching zones 6 are therefore contiguous in the same way that the parts are contiguous. The following is then performed for each part: placing of theetching zone 6 corresponding to said part at the periphery of the workingzone 5 and at right angles to the optical axis Z and etching of said part of the image. The fact that theetching zone 6 is arranged at the periphery of the workingzone 5 guarantees that the mean angle of incidence of thelaser beam 12 is high. A large image can thus be etched, part by part, by repositioning the support and each etching zone between two parts, so as to always retain a high mean angle of incidence of thelaser beam 12. - Also, by thus partitioning an image, the constraint of size of the
etching zone 6 that can be etched in a single operation, without displacement of the support, does not lead to any limitation of the size of an image. Thus, the size of at least one image, if necessary covered by thelenticular grating 9, is not limited and can occupy a surface greater than 1 cm2. It is thus possible to produce, for example, an image of a size greater than 3.5×4.5 cm, thus making it possible to produce an identity photo. - Advantageously, the plurality of etched images comprising the first image and said at least one second image are chosen paired so as to produce a 3D effect. Paired is understood here to mean images of one and the same subject/object seen from different angles, so as to reproduce a relief effect when the images are seen in sequence.
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FR1563244 | 2015-12-23 | ||
FR1563244A FR3046112B1 (en) | 2015-12-23 | 2015-12-23 | METHOD FOR MAKING SELECTIVELY VISIBLE IMAGES BY VARYING THE ENGRAVING OBSERVATION ANGLE THROUGH A LENTICULAR NETWORK |
PCT/FR2016/053612 WO2017109412A1 (en) | 2015-12-23 | 2016-12-21 | Process for producing, by etching through a lenticular grating, images that may be selectively viewed by varying angle of observation |
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US20190094559A1 true US20190094559A1 (en) | 2019-03-28 |
US11143881B2 US11143881B2 (en) | 2021-10-12 |
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EP (1) | EP3393820B1 (en) |
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CN111546800B (en) * | 2020-06-12 | 2023-04-25 | 山东泰宝信息科技集团有限公司 | Point light source identification laser encryption plastic film hot stamping foil and preparation method thereof |
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US6069680A (en) * | 1998-08-03 | 2000-05-30 | Eastman Kodak Company | Flying spot laser printer apparatus and a method of printing suitable for printing lenticular images |
US6288842B1 (en) * | 2000-02-22 | 2001-09-11 | 3M Innovative Properties | Sheeting with composite image that floats |
CA2376890A1 (en) * | 2000-04-19 | 2001-10-25 | Nobuo Hori | Card genuine judging apparatus and card genuine judging system |
FR2883503B1 (en) * | 2005-03-23 | 2020-11-06 | Datacard Corp | HIGH RATE LASER MARKING MACHINE |
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PT2050574E (en) | 2007-09-27 | 2009-11-17 | Foba Technology & Services Gmb | Method and device for scribing a kinegram structure |
US7995278B2 (en) * | 2008-10-23 | 2011-08-09 | 3M Innovative Properties Company | Methods of forming sheeting with composite images that float and sheeting with composite images that float |
US8582208B2 (en) | 2009-12-18 | 2013-11-12 | Sagem Identification Bv | Method and apparatus for manufacturing a security document comprising a lenticular array and blurred pixel tracks |
FR2958777A1 (en) | 2010-04-07 | 2011-10-14 | Jean Pierre Lazzari | DEVICE FOR CUSTOMIZING RECESSED LATENT IMAGES |
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CN109414949B (en) | 2021-06-08 |
US11143881B2 (en) | 2021-10-12 |
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EP3393820B1 (en) | 2021-09-22 |
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